CN219042021U

CN219042021U - Billet induction heater

Info

Publication number: CN219042021U
Application number: CN202223330777.3U
Authority: CN
Inventors: 姜滔; 刘顺; 刘勇; 李伟红; 王强; 徐龙飞; 廖芸; 杨宏; 蒋晓奇; 兰芳; 马志民; 陈光夫
Original assignee: Hunan Zhongke Electric Co ltd
Current assignee: Hunan Zhongke Electric Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-16
Anticipated expiration: 2032-12-13

Abstract

The utility model provides a billet induction heater. The billet induction heater comprises a shell, castable, a magnetic yoke assembly, copper bars, coils and an insulating piece; the magnetic yoke assembly is arranged on at least one side surface of the coil, the insulating piece is arranged between the coil and the magnetic yoke assembly, the magnetic yoke assembly and the coil are arranged in the shell, and the casting material is arranged in the shell to cover the magnetic yoke assembly and the coil; the copper bar vertically penetrates through the shell and is connected with the coil; the shell is provided with a channel hole communicated with the coil inner cavity. According to the utility model, the magnetic yoke assembly is introduced around the coil, most of the magnetic field generated by the coil is concentrated in the silicon steel lamination with extremely high magnetic permeability when the magnetic field travel is closed, the loss of the magnetic field in the whole loop is greatly reduced, and the magnetic induction heating efficiency is greatly improved.

Description

Billet induction heater

Technical Field

The utility model relates to the technical field of billet machining, in particular to a billet induction heater.

Background

The temperature of the steel billet is required to meet certain conditions in continuous casting steel billet rolling, and in general, the temperature of the rolled steel billet is required to be not lower than 900 ℃. Then, the cold steel billet is heated by the gas furnace and then is conveyed to a cold rolling mill, or the continuously cast steel billet is directly conveyed to a rolling mill, and the temperature of the steel billet is reduced in the conveying process, so that the temperature regulation of rolling cannot be satisfied. The method of preheating the cold steel billet to a higher temperature in the gas furnace to make up for the heat dissipation during conveying is adopted, so that the energy consumption cost is greatly increased, the oxidation degree of the steel billet is increased, and the yield of finished products is reduced. On the other hand, in the process of conveying and rolling the steel billets, the heat dissipation time in the air before the front and rear parts of the steel billets enter the rolling mill is different due to the different moving speeds of the steel billets, and the temperatures of the head and the tail of the steel billets are different.

When the electromagnetic induction heating technology is used for heating the steel billet, the electromagnetic induction heating technology is widely applied in nearly twenty years because the electromagnetic induction heating technology has the advantages of no oxidation and decarbonization of the steel billet, good heating quality, environmental protection, energy conservation and emission reduction, high heating speed, high efficiency, small equipment volume, space saving, improvement of labor conditions and the like. The electromagnetic induction heating technology can better solve the problems. Before billet rolling, the billet is heated by an electromagnetic induction heating technology, so that the rolling temperature of the billet can be ensured, the intelligent monitoring and heating of equipment can be realized, and the uniformity of the temperature of the billet from the head to the tail can be ensured, thereby ensuring the temperature of a rolling process, ensuring the quality of a rolled finished product, prolonging the service life of a roller and reducing the running cost of the equipment.

The coil of the electromagnetic induction heater for heating or supplementing the billet is generally wound into a spiral shape, the billet moves in a central channel of the spiral coil during heating, and the billet is in an alternating magnetic field under the action of the alternating current coil, so that induced current is generated on the section of the billet to generate heat. When the steel billet is heated, the low-temperature and magnetic conduction steel billet serves as an iron core of the coil, the heat efficiency is relatively high, but as the temperature of the steel billet is increased, the magnetic conductivity of the steel billet is reduced until the magnetic conductivity disappears, and the heating efficiency is gradually reduced to be stable; when the temperature of the steel billet is above the Curie point for heat compensation, the magnetic permeability of the steel billet is the same as that of non-magnetic air, and the heating efficiency is low. The magnetic force lines generated after the hollow spiral coil is electrified come out from the end face of one side of the coil, are dispersed to the periphery of the channel, and then return to the end face of the other side of the coil from the outside of the coil. As can be seen from the distribution of the magnetic field generated by the electrified coil around, most of magnetic lines of force run Cheng Huilu in the air with extremely high magnetic resistance, so that the magnetic field loss is extremely high, the heating efficiency is extremely low, the energy consumption of billet heating is high, and the cost of billet heating is high.

The existing billet induction heater adopts a hollow solenoid for heating, most of magnetic lines of force travel in air with extremely large magnetic resistance, the magnetic field loss is large, the heating efficiency is low, and the energy consumption and the cost for billet heating are high.

Disclosure of Invention

The utility model aims to provide a billet induction heater, wherein a magnetic field generated by an electrified coil is gathered in a magnetic yoke through the magnetic yoke around the coil and is guided from one side end face to the other side end face of the coil, and when the magnetic field forms a loop in the magnetic yoke with extremely high magnetic permeability, the magnetic field loss is extremely small, so that the heating efficiency is greatly improved, and the heating energy consumption and the heating cost are reduced.

The technical scheme of the utility model is as follows: a billet induction heater comprises a shell, casting materials, a magnetic yoke assembly, copper bars, coils and an insulating piece; the magnetic yoke assembly is arranged on at least one side surface of the coil, the insulating piece is arranged between the coil and the magnetic yoke assembly, the magnetic yoke assembly and the coil are arranged in the shell, and the casting material is arranged in the shell to cover the magnetic yoke assembly and the coil; the copper bar vertically penetrates through the shell and is connected with the coil; the shell is provided with a channel hole communicated with the inner cavity of the coil.

Preferably, the magnetic yoke assembly comprises a first edge part coated on the outer surface of the length of the coil and a second edge part coated on two end surfaces of the coil, and a gap alpha is arranged between the second edge part and the coil.

Preferably, the gap α=10mm.

Preferably, the section of the coil is rectangular, circular or square.

Preferably, the number of the magnetic yoke assemblies is two, and the two magnetic yoke assemblies are respectively arranged on opposite sides of the coil.

Preferably, the billet induction heater further comprises a water inlet pipe and a water outlet pipe; the magnetic yoke assembly comprises silicon steel laminations, cooling copper plates and cooling copper pipes, wherein a plurality of silicon steel laminations are overlapped, a plurality of cooling copper plates are arranged at the upper ends of the silicon steel laminations, a channel is formed between every two cooling copper plates, the cooling copper pipes are rotatably installed in the channel, a water inlet and a water outlet are respectively formed at two ends of each cooling copper pipe, the water inlet is communicated with the water inlet pipe, and the water outlet is communicated with the water outlet pipe.

Preferably, the thickness of the casting material is 20mm, and the thickness of the insulating member is 10mm.

Compared with the related art, the utility model has the beneficial effects that:

1. according to the billet induction heater, the magnetic yoke assembly is introduced around the coil, most of the magnetic field generated by the coil is concentrated in the silicon steel lamination with extremely high magnetic permeability when the magnetic field stroke is closed, the loss of the magnetic field in the whole loop is greatly reduced, and the magnetic induction heating efficiency is greatly improved;

2. according to the steel billet induction heater, the efficiency of magnetic induction heating is greatly improved, so that the energy consumption for heating the steel billet is greatly reduced, and the heating cost is also greatly reduced;

3. the billet induction heater has the advantages that after magnetic force lines are concentrated in the magnetic yoke assembly, the magnetic field scattered in the air is greatly reduced, so that the influence of the magnetic field on surrounding equipment and the influence of the magnetic field on the body of field personnel are reduced.

Drawings

Fig. 1 is a schematic perspective view of a billet induction heater according to the present utility model;

FIG. 2 is a schematic front cross-sectional view of FIG. 1;

FIG. 3 is a schematic top cross-sectional view of FIG. 1;

FIG. 4 is a schematic side sectional view of FIG. 1;

FIG. 5 is a schematic view of a first combination structure of a coil and yoke assembly;

FIG. 6 is a schematic view of a second combination structure of a coil and yoke assembly;

FIG. 7 is a schematic view of a third combination structure of a coil and yoke assembly;

FIG. 8 is a schematic view of a fourth combination structure of a coil and yoke assembly;

FIG. 9 is a schematic view of a fifth combination structure of a coil and yoke assembly;

fig. 10 is a schematic structural view of the yoke assembly.

In the accompanying drawings: 1. a housing; 11. a passage hole; 2. casting materials; 3. a yoke assembly; 31. a first edge; 32. a second edge portion; 33. silicon steel lamination; 34. cooling the copper plate; 35. cooling the copper pipe; 4. a water inlet pipe; 5. a copper bar; 6. a coil; 7. an insulating member; 8. and a water outlet pipe.

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.

As shown in fig. 1 to 4, the steel billet induction heater provided in this embodiment includes a housing 1, a casting 2, a yoke assembly 3, a water inlet pipe 4, a copper bar 5, a coil 6, an insulating member 7, and a water outlet pipe 8.

The shell 1 is of a rectangular structure and is formed by surrounding upper and lower side walls, front and rear side walls, left and right side walls. The upper, lower, front and rear side walls are made of non-magnetic conductive and non-conductive composite plates with certain strength, the left and right side walls are provided with channel holes 11 communicated with the inner cavity of the coil 6, and the left and right side walls are made of non-magnetic conductive metal materials.

The section of the coil 6 is rectangular, round, square, H-shaped or other irregular shapes, or a magnetic conductive material (such as silicon steel lamination) may be disposed on the path of the magnetic line loop, and the size of the magnetic conductive material may be designed according to the spatial position (as long as the magnetic conductive material exists on the path of the magnetic line, no matter the size, the magnetic loss may be reduced, and the magnetic field heating efficiency is improved). In this embodiment, the coil 6 is square, and the periphery is chamfered. The yoke assembly 3 is arranged on at least one side of the coil 6. I.e. the number of coils 6 of the yoke assembly 3 may be one (as shown in fig. 9); may be two (as shown in fig. 7 and 8) provided on opposite sides of the coil 6. May be three (as shown in fig. 6); but may also be four (as shown in fig. 5). Alternatively, when the coils 6 are circular, the number of the yoke assemblies 3 may be more than four.

As shown in fig. 10, the yoke assembly 3 includes a silicon steel laminate 33, a cooling copper plate 34 and a cooling copper tube 35, and the silicon steel laminate 33 is laminated with a plurality of pieces to form a rectangular body shape. The length of the yoke assembly 3 is adapted to the length of the coil 6. The cooling copper plates 34 are arranged at the upper ends of the silicon steel laminations 33, a plurality of channels are formed between every two cooling copper plates 34, the cooling copper pipes 35 are rotatably arranged in the channels, two ends of the cooling copper pipes 35 are respectively provided with a water inlet and a water outlet, the water inlet is communicated with the water inlet pipe 4, and the water outlet is communicated with the water outlet pipe 8. The water inlet pipe 4 and the water outlet pipe 8 are used for enabling cooling water to enter the shell 1, are communicated with the cooling copper pipe 35 through a structure and a hose, and are led out for circulating cooling.

A hollow is provided in the middle of the lower end of the silicon steel lamination 33, so that a first edge 31 provided in the middle and a second edge 32 extending vertically at two ends of the first edge 31 are formed at the lower end of the laminated silicon steel lamination 33. The hollowed-out shape is matched with the coil 6. That is, the first side portions 31 are wrapped around the outer longitudinal surface of the coil 6, and the second side portions 32 are wrapped around the end surfaces of the coil 6. And an insulator 7 is provided between the first side 31 and the coil 6 and between the second side 32 and the coil 6, the thickness of the insulator 7 being 10mm. A gap α, α=10mm is provided between the second side portion 32 and the coil 6. The gap α is set so that the length of the yoke assembly 3 is slightly longer than the length of the coil 6. The yoke assembly 3 is provided with a first side 31 and a second side 32, forming a corner wrapping for the coil 6, where space dimensions allow, to ensure a smaller magnetic field loss. When the length of the billet induction heater is limited, the second side 32 may be removed, leaving only the first side 31 in contact with the coil 6.

Two pins are arranged on the coil 6 and are respectively connected with the copper bars 5. The copper bar 5 vertically passes through the upper end of the shell 1.

The yoke assembly 3 and the coil 6 are placed in the housing 1, and the casting 2 is disposed in the housing 1 to cover the yoke assembly 3 and the coil 6. The thickness of the castable 2 was 20mm. The casting compound 2 is used to encapsulate and fix the coil 6 and to protect the coil 6 from contact with the heated billet. The castable 2 ensures that the coil 6 and the magnetic yoke assembly 3 are integrally sealed.

The copper bar 5 vertically passes through the housing 1 and is connected with the coil 6. The copper bar 5 is used for inputting and outputting power supply. The housing 1 is provided with a passage hole 11 communicating with the coil 6.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. The billet induction heater is characterized by comprising a shell (1), casting materials (2), a magnetic yoke assembly (3), copper bars (5), coils (6) and an insulating piece (7); the magnetic yoke assembly (3) is arranged on at least one side surface of the coil (6), the insulating piece (7) is arranged between the coil (6) and the magnetic yoke assembly (3), the magnetic yoke assembly (3) and the coil (6) are arranged in the shell (1), and the castable (2) is arranged in the shell (1) to cover the magnetic yoke assembly (3) and the coil (6); the copper bar (5) vertically penetrates through the shell (1) and is connected with the coil (6); the shell (1) is provided with a channel hole (11) communicated with the inner cavity of the coil (6).

2. The steel billet induction heater according to claim 1, wherein the yoke assembly (3) comprises a first edge portion (31) coated on the outer surface of the length of the coil (6) and a second edge portion (32) coated on two end surfaces of the coil (6), and a gap α is provided between the second edge portion (32) and the coil (6).

3. The steel billet induction heater according to claim 2, wherein the gap α = 10mm.

4. Billet induction heater according to claim 1, characterized in that the coil (6) has a rectangular, circular or square cross section.

5. Billet induction heater according to claim 1, characterized in that the yoke assembly (3) is two, separate on opposite sides of the coil (6).

6. The steel billet induction heater according to claim 1, further comprising a water inlet pipe (4) and a water outlet pipe (8); the magnetic yoke assembly (3) comprises silicon steel laminations (33), cooling copper plates (34) and cooling copper pipes (35), wherein a plurality of silicon steel laminations (33) are overlapped, a plurality of cooling copper plates (34) are arranged between the upper ends of the silicon steel laminations (33), channels are formed between every two cooling copper plates (34), the cooling copper pipes (35) are rotatably arranged in the channels, a water inlet and a water outlet are respectively formed at two ends of each cooling copper pipe (35), the water inlet is communicated with the water inlet pipe (4), and the water outlet is communicated with the water outlet pipe (8).

7. Billet induction heater according to claim 1, in which the thickness of the casting compound (2) is 20mm and the thickness of the insulating element (7) is 10mm.